JPS6232369Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is used in video disc players.
The present invention relates to a lid safety holding mechanism for a video disc player in which a drive spindle is automatically braked to a stopped state when the lid is opened.

Generally, in a video disc player, the disc drive spindle rotates at 1800 or 1500 revolutions per minute, and when opening the lid, the drive spindle must be automatically braked to a stopped state. However, since the video disc rotates at high speed, even if you turn off the motor when opening the lid, it will not suddenly stop due to inertia, so it is dangerous to touch a video disc that rotates at high speed, and the disc may be damaged. There is a risk that the player may fly out of the drive spindle, and a safety measure to protect the user of the player has been desired.

In other words, the high-speed rotating disc in a video disc player continues to rotate due to inertia even after the motor is turned off, so even if a mechanical brake mechanism is added, the motor needs to stop immediately. This is undesirable as it puts a load on the outside.

This idea was made based on the above-mentioned circumstances, and the command to turn off the power to the motor simultaneously releases one of the two hooks for keeping the lid closed and releases the other. The hook uses the back electromotive force generated by the inertia of the motor to drive a solenoid to move the lid to a position that holds it in the closed state. After a few seconds, when the back electromotive force approaches OV, the aforementioned hook is released from the suction force of the solenoid and returned to its original state by the force of the spring, and the lid is automatically released almost at the same time as the disk stops rotating and is moved to the rear. It is configured to be opened by the spring force of the installed hinge or by the force of an auxiliary lid-pushing spring.

In other words, the lid holding mechanism using back electromotive force is a conventional method, but
By holding the closed lid with two hooks, the complexity of operation caused by locking the lid in the half-open state is eliminated, and the lid remains completely closed until the motor stops. be.

Hereinafter, one embodiment of this invention will be described in detail based on the attached drawings. In the figure, reference numeral 1 denotes a brake drum that is integrated with the turntable, and is adapted to be braked from the outer circumferential side by a brake shoe 2a of a brake 2. 3 is a spring that presses the brake 2 against the brake drum 1; The brake 2 is operated by rotating the brake operating lever 4 about the fulcrum 5 in the direction of arrow B.
is spaced apart from the brake drum 1.

Reference numeral 6 denotes a cover of the turntable, and a lock window 7 is formed at the front end, and an engaging portion 8 having a locking groove 8a is installed below the lock window 7.

Further, a cam 10 having an inclined surface is provided on the lever 9 on the chassis, and when the lid 6 is closed, the engaging portion 8 of the lid 6 comes into contact with the cam 10, and the lever 9 moves in parallel in the direction of arrow A, thereby leveraging the brake operating lever. 4 in the direction of arrow B and turn on the motor power switch 11.
I'm starting to do that. 12 is a lever, and when a push button installed on an exterior case (not shown) is pressed, the lever 12 slides in the direction of arrow C, and while the lever 9 continues to move in the direction of arrow A, the approximately center point of the lever 9 is set as a fulcrum. It is designed so that it can be rotated several millimeters. Reference numeral 13 is a solenoid, and when the motor power switch 11 is turned off, the solenoid 13 is operated by extracting the back electromotive force generated while the motor attached to the disk is rotating due to the rotational inertia of the disk. Return the lower end of the safety lock pawl 14 against the arrow D
direction, the tip 14a is locked in the locking groove 8a formed in the engaging portion 8 of the lid 6. Reference numeral 16 denotes a hook, which is pressed by a spring 17 and is locked in the lock window 7 of the lid 6. When the lever 12 is slid in the direction of arrow C and the lever 9 is rotated, the cam 1
The lock window 7 of the lid 6 is released by being pushed back to 0. Note that when the current (back electromotive force) to the solenoid 13 disappears, the safety lock pawl 14 is released from the locking groove 8a of the lid 6 by the return spring 15, and the lid 6 is held in the released state. Note that 1 in the figure
Reference numerals 8 and 19 are return springs for the lever 9.

The operation of the lid safety retention mechanism in the video disc player configured as described above will be explained. Install the disc on the turntable and close the lid 6
When the lid 6 is closed, the engaging part 8 of the lock window 7 installed at the front end of the lid 6 descends and hits the cam 10 which is installed on the lever 9 and has an inclined surface.When the lid 6 is further pushed in, the component force generated on the cam 10 The lever 9 then moves in parallel in the direction of arrow A, and as shown in FIG.
Locked by 6. At the same time, the lever 9 rotates the brake operating lever 4 about the fulcrum 5 in the direction of arrow B, and the brake shoe 2a of the brake 2 is rotated.
is released from the outer periphery of the brake drum 1, and the motor power switch 11 is turned on. Therefore,
The motor begins to rotate, and the video disc turntable (integrated with the brake drum 4) rotates, resulting in a playing state.

Next, the lever 12 is activated by pressing a push button (not shown) installed in the outer case in order to issue a command to stop playing and perform operations such as attaching and detaching the disk.
When the lever 9 is slid in the direction of the arrow C, the lever 9 rotates several millimeters about the approximately midpoint of the lever 9 as a fulcrum while moving in the direction of the arrow A. As a result, the tip on the opposite side rotates in the direction of arrow C and comes off the brake operating lever 4, the brake 2 is activated, the brake shoe 2a brakes the brake drum 1, and the motor power switch 11 is turned off. state. Here, the back electromotive force generated while the motor mounted on the disk is rotating due to the inertia of the brake drum 1 is extracted, and a current is applied to the solenoid 13, and the lower end of the safety lock pawl 14 of the lid is pulled. top end 1
4a rotates in the direction of arrow D and engages with a locking groove 8a of an engaging portion 8 installed on the lid 6. At this time, the above-mentioned hook 16 is moved to the cam 1 by the rotation of the lever 9.
0 and is released from the lock window 7 of the lid 6, but the lid 6 is held by the safety lock pawl 14 and does not open. After that, the counter electromotive force becomes OV in a few seconds, and when the rotation of the disk stops, the current to the solenoid 13 disappears, and the force of the return spring 15 releases the safety lock pawl 14 from the locking groove 8a, and the lid 6 opens. The lid 6 is opened by the spring force of a hinge (not shown) installed at the rear of the lid 6.

Furthermore, when the motor is not rotating, the safety lock pawl 14 remains in the down position because current does not flow through the solenoid 13, and it does not operate to open or close the lid 6, so only the hook 16 moves independently. It's summery.

As explained in detail above, the lid safety retention mechanism according to this invention allows the lid to be opened and closed even when the power is not turned on by using two hooks with different functions. The shape of the claw has a simple structure in which the part exposed to the outside of the set has good appearance and strength.

In addition, the lid is completely closed until the rotation of the disk stops, so there is no complication in operation caused by the lid being locked in a half-open state, and there is no danger of damage due to erroneous operation. Furthermore, it is an effective safety measure that protects the user of the player.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts showing an embodiment of this invention, and FIG. 2 is a perspective view of the main parts shown in FIG. 1 with the lid closed. 1...brake drum, 2...brake, 4...
... Brake operating lever, 6 ... Lid, 7 ... Lock window, 8 ... Engagement part, 8a ... Locking groove, 9 ... Lever, 10 ... Cam, 11 ... Power switch, 12
... lever, 13 ... solenoid, 14 ... safety lock pawl, 15 ... return spring, 16 ... hook, 17 ... spring.

Claims (1)

[Scope of utility model registration request] In a video disc player, a hook for closing the lid and a safety lock pawl are provided on the turntable, a lock window and an engagement groove in which the hook and the safety lock pawl engage are provided at the front end of the lid, and the hook locks the lid. The safety lock pawl, which is engaged when the lid is closed, is locked by a solenoid operated by a counter electromotive force generated by a command to stop the rotation of the disk, and the hook disengages the lid, causing the rotation of the disk to stop. 1. A safety holding mechanism for a lid in a video disc player, characterized in that a safety lock pawl is associated with the lid to release the lock when the lid is opened.